pool 1.0.0

New features

• Pool has been re-licensed to MIT (#158).

• dbPool() gains an onCreate parameter that allows you do something to
  every connection that pool creates. This is useful for setting options that
  you want to apply to every connection (#98).

• New localCheckout() checkouts and then automatically returns an object.
  It only works in function scope.

Minor improvements and bug fixes

• Pools now get a useful print method (#140).

• pool now implements the dbplyr 2.0.0 interface, eliminating warnings when
  using pool with dplyr (#132).

• Pool errors and warnings have been reviewed with an eye to making them
  more immediately actionable (#145).

• Objects are now validated once on first checkout to ensure that the
  object and validation strategy are both ok.

• Added support for SAP HANA databases (@marcosci, #103).

• dbPool() and poolCreate() now default to validating every 60s, rather
  than every 600s. This makes pools a little more robust to shorter connection
  timeouts (#149).

• dbPool()'s validateQuery is now actually used (#153).

• DBI methods should dispatch correctly in more cases; in particular
  dbReadTable() and friends will now work correctly when used with
  DBI::Id() (#120).